Xpand X101 IR protocol

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Petrus
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Xpand X101 IR protocol

Post by Petrus »

I bought an Xpand X101 shutterglasses but to use it, I needed to figure out how the glasses synchronize with the projector.
As you may already know, the Xpand X101 use an infrared encoded communication.

I don't have access to an Xpand emitter,so I needed to record the Infrared pulses on an Xpand equipped cinema. I cant bring my oscilloscope to the cinema so I build a circuit that measure the pulse timings and send them on an MP3 audio recorder using the serial output of an Atmega8 microcontroller :
Image

To read the data, I just have to plug the PC serial port on the comparator output and play the recorded MP3.

The IR pulses can be interpreted as binary code :
Image

The code that activate the glasses isn't send at every frame. It is send periodically, always after a Ron-Loff command. I don't know the original frequency but it's not important as the glasses only need it once to activate after a communication loss.
I personally send the code every 100ms to get a fast recovery after a communication loss.

I've also made a program to find the code by brute force it (try every combination) but my pair of X101 seems to activate whatever the code so it was not very useful.

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Re: Xpand X101 IR protocol

Post by Fredz »

Petrus wrote:I personally send the code every 100ms to get a fast recovery after a communication loss.

I've also made a program to find the code by brute force it (try every combination) but my pair of X101 seems to activate whatever the code so it was not very useful.
Nice work, what did you use to send the signal to the glasses btw ?

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Re: Xpand X101 IR protocol

Post by cybereality »

Very cool. If I were rich I would hire you to be my personal hacker!

So what are you going to use this for?

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Re: Xpand X101 IR protocol

Post by Petrus »

I used the timings to program my home-made universal emitter and thus making it compatible with Xpand X101 glasses.
I will do an other topic about it.

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Re: Xpand X101 IR protocol

Post by Okta »

Awesomeness man. Now you just need to work out how to read DX info and make emmitters for frame sequential Iz3d drivers and non nvidia glasses!
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Re: Xpand X101 IR protocol

Post by Petrus »

Sorry but this is beyond the limits of my genius.
I know electronics and microcontrollers, but I almost don't have any knowledge in computer programming.

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Re: Xpand X101 IR protocol

Post by DthMKhtD »

@Petrus
good job really!!
Can you send me some code/driver you wrote for the emitter, please?

Thanks very much!

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Re: Xpand X101 IR protocol

Post by Petrus »

All the code and schematic are already here :
http://www.mtbs3d.com/phpBB/viewtopic.php?f=26&t=10183" onclick="window.open(this.href);return false;

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Re: Xpand X101 IR protocol

Post by linusoon »

Great man !
One question I have.
I found xp_code is 0x0 in your code, but 0x0814 in Xpand_X101_ir_pulses.
So what is the difference?

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Re: Xpand X101 IR protocol

Post by Petrus »

The X101 I bought seems to work whatever the code is, so I put 0x0 and it works fine with it.
The code 0x0814 on the picture is just an example to show how the code is transmitted.

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Re: Xpand X101 IR protocol

Post by Petrus »

I've made some photos of the inside of an Xpand X101 shutterglasses:
Image

And the most important, the electronics :
Image
I opened it to see how the Pi-cell LCD shutters are driven and if I can improve it. The contrast is quite low on those glasses I estimated it at 150:1.

More to come soon.

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Re: Xpand X101 IR protocol

Post by Petrus »

So this is how the Pi-cell LCD are driven on the Xpand X101:

Voltage across the LCD :
Image

Voltage on one terminal and the battery negative as the GND :
Image
To get 14V across the LCD, the electronics put the first terminal to a -11V potential and the other to the battery voltage.

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Re: Xpand X101 IR protocol

Post by lish »

Petrus wrote:So this is how the Pi-cell LCD are driven on the Xpand X101:

Voltage across the LCD :
Image

Voltage on one terminal and the battery negative as the GND :
Image
To get 14V across the LCD, the electronics put the first terminal to a -11V potential and the other to the battery voltage.
The advantage of OCB shutter is the fast response time, the contrast ration is lower than others.
And it switch to dark at a high voltage such as 14V as you mentioned( so far as I know, some OCB shutter need higher than 20V to get a more black backgroud), and 3.3V to get bright transmittance. The color of the shutter is blue or little green when no voltage on it.
Hope it is usefull for you.

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Re: Xpand X101 IR protocol

Post by Petrus »

I tried to elevate the voltage to get more contrast, but with a higher voltage the angle of vision is reduced.

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Re: Xpand X101 IR protocol

Post by tritosine5G »

So PI CELL = OCB ? Wow.

Toshiba made OCB shutter with 5000:1 extinction, also Sony shutter supposed to be pi-cell with 5000:1 and sub 2ms restart time.
-Biased for 0 Gen HMD's to hell and back must be one hundred percent hell bent bias!

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Re: Xpand X101 IR protocol

Post by lish »

tritosine wrote:So PI CELL = OCB ? Wow.

Toshiba made OCB shutter with 5000:1 extinction, also Sony shutter supposed to be pi-cell with 5000:1 and sub 2ms restart time.
:) yes, Pi cell means OCB technology
I have discussed the OCB technology with some guys from toshiba, it seems their 5000:1 contrast base on a different test method. but anyway, Toshiba masted the best OCB technology in the world

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Re: Xpand X101 IR protocol

Post by asllop »

Petrus wrote:I bought an Xpand X101 shutterglasses but to use it, I needed to figure out how the glasses synchronize with the projector.
As you may already know, the Xpand X101 use an infrared encoded communication.

I don't have access to an Xpand emitter,so I needed to record the Infrared pulses on an Xpand equipped cinema. I cant bring my oscilloscope to the cinema so I build a circuit that measure the pulse timings and send them on an MP3 audio recorder using the serial output of an Atmega8 microcontroller :
Image

To read the data, I just have to plug the PC serial port on the comparator output and play the recorded MP3.

The IR pulses can be interpreted as binary code :
Image

The code that activate the glasses isn't send at every frame. It is send periodically, always after a Ron-Loff command. I don't know the original frequency but it's not important as the glasses only need it once to activate after a communication loss.
I personally send the code every 100ms to get a fast recovery after a communication loss.

I've also made a program to find the code by brute force it (try every combination) but my pair of X101 seems to activate whatever the code so it was not very useful.
That's wonderful, very good job Petrus! Could you post the whole captured signal from the cinema?

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